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Can you tell me please what I am doing wrong here

I need to find the Vc function after we close the switch.

To do this, I calculate the Thevenin equivalent circuit.

I calculate Vth to be 21/(60+30) times 30, which makes 0.7V but why the answer is 7V????

Basically the answer is Vc=7x(.... which means that final voltage of capacitor is 7V and not 0.7V.

Any idea?

thanks